杂交玉米黔兴201不同种植密度比较试验

Comparative Experiment in the Different Planting Densities of Hybrid Maize-Qianxing 201

探索耐密型玉米黔兴201的最适种植密度。试验共设置4.50万、5.25万、6.00万、6.75万、7.50万和8.25万株/hm^2 6个种植密度,采取随机区组排列,3次重复,共18个小区,小区面积20 m^2,小区玉米种植3个双行。杂交玉米黔兴201不同种植密度比较试验结果表明：6个密度处理中,种植密度为6.75万株/hm2的产量居第1位,各种性状表现较好,生长期间植株整齐一致,抗病性较强;密度为7.50万和6.00万株/hm2的产量分别居第2位和第3位,综合性状表现好;密度为4.50万和5.25万株/hm^2,虽然穗粒数和千粒重较大,但产量不高;密度为8.25万株/hm^2,有轻微倒伏现象,造成部分果穗腐烂。试验得出：黔兴201的最佳种植密度为6.00万~7.50万株/hm^2。

The optimum planting density of density-tolerance maize-Qianxing 201 was explored.In the randomized block experiment with 3 repetitions and 18 plots,20 m2 per plot,6 planting densities of 45 000,52 500,60 000,67 500,75 000 and 82 500 plants/hm^2 were set up and the maize were planted in 3 double-rows in a plot.The comparison on different planting densities of hybrid maize Qianxing 201 showed that in 6 density treatments,the yield of the treatments with planting density of 67 500 plants/hm^2 occupied the 1st position,with the best character performance,trimly plants and stronger disease-resistance in the growing stage.The yields of the treatments with the density of 75 000 and 60 000 plants/hm^2 occupied the 2nd and 3rd position resp ectively,with good performance of comprehensive character.Although the grain number per ear and 1 000-seed weight of the treatments with the density of 45 000 and 52 500 plants/hm^2 was bigger,its yield was not high.Slight lodging appeared in the plots with density of 82 500 plants/hm^2,caused part of ears to be rot.The optimum planting density of Qianxing 201 was 60 000～75 000 plants/hm^2.